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<?php |
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/** |
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* @package s9e\TextFormatter |
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* @copyright Copyright (c) 2010-2016 The s9e Authors |
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* @license http://www.opensource.org/licenses/mit-license.php The MIT License |
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*/ |
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namespace s9e\TextFormatter\Configurator\TemplateNormalizations; |
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use DOMElement; |
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use DOMNodeList; |
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use s9e\TextFormatter\Configurator\TemplateNormalization; |
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class SetRelNoreferrerOnTargetedLinks extends TemplateNormalization |
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{ |
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/** |
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* Add rel="noreferrer" on link elements with a target attribute |
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* |
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* Adds a "noreferrer" on links that open in a new context that would allow window.opener to be |
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* accessed. |
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* |
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* @link https://mathiasbynens.github.io/rel-noopener/ |
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* @link https://wiki.whatwg.org/wiki/Links_to_Unrelated_Browsing_Contexts |
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* |
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* @param DOMElement $template <xsl:template/> node |
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* @return void |
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*/ |
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public function normalize(DOMElement $template) |
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{ |
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$this->normalizeElements($template->ownerDocument->getElementsByTagName('a')); |
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$this->normalizeElements($template->ownerDocument->getElementsByTagName('area')); |
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} |
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/** |
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* Add a rel="noreferrer" attribute to given element |
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* |
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* @param DOMElement $element |
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* @return void |
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*/ |
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protected function addRelAttribute(DOMElement $element) |
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{ |
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$rel = $element->getAttribute('rel'); |
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if (preg_match('(\\S$)', $rel)) |
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{ |
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$rel .= ' '; |
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} |
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$rel .= 'noreferrer'; |
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$element->setAttribute('rel', $rel); |
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} |
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/** |
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* Test whether given link element will let the target access window.opener |
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* |
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* @param DOMElement $element |
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* @return bool |
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*/ |
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protected function linkTargetCanAccessOpener(DOMElement $element) |
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{ |
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// Can't access window.opener if the link doesn't have a target |
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if (!$element->hasAttribute('target')) |
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{ |
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return false; |
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} |
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// Can't access window.opener if the link already has rel="noopener" or rel="noreferrer" |
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if (preg_match('(\\bno(?:open|referr)er\\b)', $element->getAttribute('rel'))) |
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{ |
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return false; |
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} |
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return true; |
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} |
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/** |
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* Normalize a list of links |
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* |
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* @param DOMNodeList $elements |
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* @return void |
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*/ |
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protected function normalizeElements(DOMNodeList $elements) |
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{ |
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foreach ($elements as $element) |
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{ |
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if ($this->linkTargetCanAccessOpener($element)) |
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{ |
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$this->addRelAttribute($element); |
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} |
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} |
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} |
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} |
s9e /
TextFormatter
